WJ-9168. The WJ-9168 Signal Monitor Module (SMM) aids receiver tuning and
signal activity monitoring when used with receivers that have a 21.4-MHz ...
Technical Data August 1996
WATKINS-JOHNSON
Signal Monitor Module WJ-9168
The WJ-9168 Signal Monitor Module (SMM) aids receiver tuning and signal activity monitoring when used with receivers that have a 21.4-MHz centered, 10-MHz bandwidth signal monitor (SM) output. The SMM collects frequency/signal strength data from the receiver SM IF output and provides this data over a serial interface to a controller such as a notebook Personal Computer (PC). The PC then produces a panoramic display of signal activity within the receiver’s wideband IF output. The WJ-9168 is a synthesized, computer-controlled, dualconversion tuner with a logarithmic power detector. Two IF inputs allow an operator to select either of two simultaneously connected receivers. The module has 8 or 25 kHz selectable IF bandwidth (IFBW) and a choice of seven sweep spans from 0.1 to 10 MHz. A single, user-supplied 10 to 16 Vdc input provides the internal power. The mechanical package of the WJ-9168 SMM uses modern surface-mount technology to produce a durable cost-effective unit. Two glass-epoxy printed circuit boards divide the SMM circuitry. One contains an RF converter, IF filters, synthesizers, and log amplifier. The other board contains the power supply, digital controller, and remote interfaces. The two printed circuit cards are fastened into a milled-aluminum chassis for RF isolation and structural support. The two IF inputs are through SMA connectors, while the control signals are on microminiature D connectors. A 1.3 mm jack, or a pin on one of the D connectors,
WATKINS-JOHNSON COMPANY 700 Quince Orchard Road, Gaithersburg, Maryland 20878-1794 Phone: (800) WJHELPS or +(301) 948-7550 FAX: +(301) 921-9479 Email:
[email protected] Website: www.wj.com Printed in the U.S.A.
Features ❏ 10-MHz full span for use with 21.4-MHz IF receivers ❏ Low power: +5 dBm input 3rd-order intercept point ❏ >60 dB dynamic range with 60 dB 3rd-Order Intercept .............................................................>+5 dBm Image & IF Rejection ...........................................................-60 dBc LO Level at IF Inputs ..........................................................-70 dBm, max Control Interfaces ................................................................RS-232, RS-422 full-duplex (single drop or multidrop) RS-232 pass-thru mode RS-485 half-duplex multidrop BAUD Rates .........................................................................2400, 9600, 19.2 k, 38.4 k BAUD Power Input .........................................................................10 to 16 Vdc (2.5 W, max) Receiver Case Temperature Operating Range ..............................................................-20 to +55oC Non-Operating Range ...................................................... -40 to +70oC Full Specification Compliance ............................................. +20 to +30oC Humidity ..............................................................................95% relative humidity, non condensing
Receiver Connectors I/O Inputs
Outputs
Function
Type
IF #1 IF #2
SMA SMA
Power
9-pin D#1 1.3 mm
RS-232, RS-422 & RS-485 Interfaces
9-pin D #1
Spectrum Invert (SPTI) 1 & 2
9-pin D #2
RS-232 Pass-thru Interface
9-pin D #2
4
